The average solar panel system costs £6,000–£8,000 and can save £500–£1,000 a year on electricity bills
A typical 3.5 to 4 kWp system, which is roughly 10 panels, costs between £6,000 and £8,000 installed according to Energy Saving Trust 2026 average cost data (Energy Saving Trust, 2026). Annual savings depend on your electricity tariff, how much power you use during daylight hours, and the proportion of solar electricity you consume directly rather than exporting to the grid. The Energy Saving Trust estimates a typical household saves between £500 and £1,000 per year on electricity bills, based on a 2026 average unit rate of 28p/kWh (Ofgem, 2026).
Solar panels are worth it for most UK homes, saving £500-£1,000 per year on bills. The typical payback period is 8-12 years, and they can increase your home value by up to 4%. Check your roof suitability and compare quotes.
- Average solar panel system costs £6,000-£8,000 installed.
- Annual savings range from £500 to £1,000 on electricity bills.
- Payback period is typically 8-12 years for a standard system.
- Adding a battery can shorten payback to 8-9 years.
- Solar panels can increase home value by up to 4%.
- The average solar panel system costs £6,000–£8,000 and can save £500–£1,000 a year on electricity bills
- The payback period for solar panels is typically 8–12 years
- Solar panels can increase your home's value by up to 4%
- Quick numbers solar panel costs, savings, and payback
- The direct answer to "are solar panels worth it" depends on your roof, usage, and budget
- You must use an MCS-certified installer to qualify for the Smart Export Guarantee and grants
- The Smart Export Guarantee pays you for electricity you don't use, but rates are low
- Solar panels also reduce your carbon footprint by roughly 1.2 tonnes of CO₂ per year
That savings figure assumes you use around 50% of the solar electricity you generate, with the remainder exported to the grid at a lower rate. If you use more of your generation directly, your savings will be higher. If you export most of it, your savings will be lower because export payments are much smaller than the cost of buying grid electricity.
The payback period for solar panels is typically 8–12 years
The payback period is the time it takes for your cumulative savings to equal the upfront cost of the system. It is calculated by dividing the total installed cost by the annual savings. For a £7,000 system generating £600 in annual savings, the payback is roughly 11.7 years, following the Energy Saving Trust payback calculator methodology (Energy Saving Trust, 2026).
Payback is shorter, around 8 to 9 years, if you have high daytime electricity usage or if you add a battery to store surplus generation for evening use, which increases self-consumption. Payback is longer, over 12 years, if you export most of your generation at the low Smart Export Guarantee rate, which averages 5 to 8p per kWh according to Ofgem SEG data for 2026 (Ofgem, 2026).
Solar panels can increase your home’s value by up to 4%
A 2026 study from the Department for Energy Security and Net Zero found that homes with solar panels sell for an average of 2 to 4% more than comparable homes without (DESNZ, 2026). The uplift is more pronounced in areas with higher electricity costs and among buyers who prioritise lower running costs.
The increase is not guaranteed and depends on the condition, age, and ownership of the system. Owned systems add value; leased systems can complicate a sale. If you sell within the payback period, the added value may offset the remaining capital outlay, but you should not rely on this as a guaranteed return. The property market varies, and local buyer preferences differ.
Quick numbers solar panel costs, savings, and payback
| System size | Installed cost | Annual saving | Payback period | CO₂ saved per year |
|---|---|---|---|---|
| 3.5 kWp | £6,000–£8,000 | £500–£700 | 9–12 years | 1.0–1.2 tonnes |
| 4 kWp | £7,000–£9,500 | £600–£850 | 9–11 years | 1.2–1.5 tonnes |
| 5 kWp | £8,500–£12,000 | £750–£1,000 | 10–12 years | 1.5–1.8 tonnes |
Sources: Energy Saving Trust cost data and savings estimates for 2026 (Energy Saving Trust, 2026). Carbon savings use the DESNZ grid average carbon factor of 0.212 kg CO₂ per kWh for 2026 (DESNZ, 2026).
The direct answer to “are solar panels worth it” depends on your roof, usage, and budget
Solar panels are worth it if you have a south-facing or east-west roof with minimal shading, you use a lot of electricity during daylight hours, and you can afford the upfront cost. They are less worth it if your roof is north-facing, heavily shaded, or if you are out all day and export most of your generation at low SEG rates.
A typical household that uses 3,500 kWh per year and has a south-facing roof can expect to cover 40 to 50% of its electricity use from solar, according to Energy Saving Trust modelling (Energy Saving Trust, 2026). If you plan to stay in your home for at least 10 years, the financial case is stronger. If you move sooner, the payback may not complete, and you rely on the property value uplift to recover your investment.
how to check if your roof is suitable for solar panels
You must use an MCS-certified installer to qualify for the Smart Export Guarantee and grants
All solar panel installers must be certified under the Microgeneration Certification Scheme (MCS) to allow you to claim Smart Export Guarantee payments from your energy supplier. MCS certification ensures the system meets technical standards and is installed safely. Check the MCS Installer Database before hiring (MCS, 2026).
TrustMark registration is also required for any government-funded schemes like the Great British Insulation Scheme or ECO+ in 2026 (TrustMark, 2026). For electrical work, the installer should be registered with NICEIC or NAPIT. For roof work, check if they are FENSA-registered for any glazing changes, though this is rare for solar installations (FENSA, 2026).
The Smart Export Guarantee pays you for electricity you don’t use, but rates are low
The Smart Export Guarantee requires licensed electricity suppliers to pay you for every kWh of solar electricity you export to the grid (Ofgem, 2026). Most SEG tariffs pay between 4p and 12p per kWh, with the average around 6 to 8p per kWh as of 2026.
You can only receive SEG if you have an MCS-certified system and an export meter or a deemed export arrangement. The SEG is a fixed-term contract, typically 12 months, and you can switch suppliers to get a better rate. However, the total income is usually £50 to £150 per year for a typical 4 kWp system. This is significantly less than the value of using that electricity yourself.
Solar panels also reduce your carbon footprint by roughly 1.2 tonnes of CO₂ per year
The average UK household electricity use produces about 1.7 tonnes of CO₂ per year, based on the DESNZ grid average carbon intensity of 0.212 kg per kWh for 2026 (DESNZ, 2026). A 4 kWp solar system generating 3,800 kWh per year and offsetting grid electricity saves around 1.2 tonnes of CO₂ annually, according to Energy Saving Trust calculations (Energy Saving Trust, 2026).
This is equivalent to taking a small petrol car off the road for about 3,000 miles, using DESNZ conversion factors for 2026. The carbon saving is immediate and does not depend on payback. It is a separate environmental benefit from the financial case, and it applies regardless of whether you sell your home or move before the system pays for itself.
how solar panels reduce your carbon footprint explained
Frequently Asked Questions
A typical 3.5-4 kWp system saves £500-£1,000 per year on electricity bills, based on Energy Saving Trust 2026 data. Actual savings depend on how much solar power you use directly.
The payback period is typically 8-12 years, according to the Energy Saving Trust payback calculator methodology. This varies with your electricity usage and export rate.
Yes, a 2026 Department for Energy Security and Net Zero study found homes with solar panels sell for up to 4% more. This adds to the financial benefit beyond energy savings.
The Smart Export Guarantee rate averages 5-8p per kWh in 2026, according to Ofgem SEG data. This is much lower than the 28p/kWh you pay for grid electricity.
Yes, a system without a battery still saves £500-£1,000 yearly, with a payback of 8-12 years. Adding a battery boosts self-consumption and can shorten payback to 8-9 years.
